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RE: Subgrade Drag Equation
[Subject Prev][Subject Next][Thread Prev][Thread Next]- To: "seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org>
- Subject: RE: Subgrade Drag Equation
- From: "Erickson, Aaron A." <AErickson(--nospam--at)wje.com>
- Date: Mon, 11 May 2009 22:21:17 -0500
- Accept-language: en-US
- Acceptlanguage: en-US
- Cc: "mpuccio(--nospam--at)mpsqrd.com" <mpuccio(--nospam--at)mpsqrd.com>
Keep in mind that shrinkage is
greater with a higher total cement(water) content in your concrete If you specify low w/c you could
get a mix with low w/c but very high cement content – more paste for
workability – more shrinkage; don’t specify more strength than you
need. Consider a larger aggregate size and limits on total cement content to obtain
a concrete that has less shrinkage. Is it true that shrinkage control
reinforcement does not get mobilized until the concrete cracks? If they really
want a large joint-less surface, would PT work? I imagine that a PT SOG would
cost more than adding a few extra joints though. ae From: Mark Puccio
[mailto:mpuccio(--nospam--at)mpsqrd.com] We are working on an industrial farm project that has a
large slab-on-ground. All joints need to have waterstop installed, so we have
been told to minimize the number to as few as possible. I was given, by
our client, a reference for joint spacing using the subgrade drag equation.
This reference refers to ACI 360 of which I have the ACI360R-06 but do
not find this equation in it. It also shows joint spacing at 79-feet with
#4 at 18. Wow this sounds like cracks waiting to happen. Not wanting to
get sued spurs some questions. Does anyone know if this equation is acceptable with current
ACI? Has anyone used this type of spacing with good results? Is this in the 360R-06 or where might if find it. Besides good curing, low W/C ratio what other factors
(besides shrinkage compensating concrete $) were used in your successful
project? Mark |
- References:
- Subgrade Drag Equation
- From: Mark Puccio
- Subgrade Drag Equation
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